Electrothermostatic fire-alarm.



No. 833,465. PATENTED OCT. 16, 1906. J. M. KNOWLES & S. A. GREGORY. ELEGTROTHERMOSTATIG FIRE ALARM.

APPLICATION FILED FEB. 26, 190B.

COM

W1 TNESSES:

A [TOR/VB Y5 UNITED STATES PATENT OFFICE.

JESSE M. KNOWLES AND SILAS A. "REGORY, OF STOGKPORT, lOVVA.

ELECTROTHERMOSTATIC FIRE-ALARM.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed ry 26, 1906. Serial No. 303.022.

T all whom it may concern! Be it known that we, JEssE M. KNowLEs and SILAS A. GREGORY, citizens of the United States, residing at Stock ort, in the county of Van Buren and State 0 Iowa, have invented a new and useful Electrothermostatic F ire-Alarm, of which the following is a specification.

This invention relates to clectrothermostatic alarms or signals for incubators, private dwellings, oflice buildings, and the like, and has for its object to provide improved means for indicating the rise and fall of the tem erature by the sounding of an alarm.

T 1e invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, and illustrated in the accompanying drawings, it being understood that various changes in form, proportions, and minor details of construction may be resorted to within the scope of the appended claims.

In the accompanying drawings, forming a part of this specification, Figure 1 1s a top plan view of an electrothermostatic alarm constructed in accordance with m invention. Fig. 2 is a side elevation of t e same. Fi 3 is a bottom plan view.

Similar numerals of reference indicate corresponding parts in all of the figures of the drawings.

In the preferred embodiment of the invention there is provided a suitable supportingframe, preferably consisting of a longitudinally-disposed bar 5, having one end thereof bent or curved upwardly to form a hook 6 and its opposite end provided with an overhanging arm 7. The curved or hooked portion of the frame is provided with suitable apertures in which are seated bushings 8, formed of porcelain, gutta-percha, or other insulating material, and in which are threaded relatively stationary contact members or screws 9 and 10. The screws 9 and 10 are provided with milled heads 1 1, which engage and clamp oneterminal 12 of an electrical circuit in which may be included a signalbell 13, the opposite terminal of the circuit being connected to a binding-post 14, secured to the curved end 6 of the supporting-frame and carrying a binding-screw 15. Supported on the bar is an expansible disk or diaphragm 16, to the lower face of which is secured a depending bracket or socket 17, haying a longitudinal recess 18 formed there n for the reception of the bar 5, as shown, said diaphragm being locked in adjusted position by a suitable clamping-screw 19, passing through a threaded opening in the socket and engaging said bar, as shown.

Secured to the upper face of the diaphragm 16 is a post 20, having its free end bifurcated for the rece tion of a movable contact mem ber or need e 21, one end of which is pivoted at 22 to the adjacent end of the overhanging arm 7. The needle 21 is formed with a longitudinally-disposed slot 23, adapted to receive a transverse pin 24, carried by the bifurcated end of the post 20, so that by moving the diaphragm 16 longitudinally of the bar 5 the throw of the needle may be regulated at will. The diaphragm 16 is preferably formed of two relatively thin metal disks, having central portions spaced apart and their marginal edges rigidly secured together, so that when the metal disks expand the movable contact 21 will engage one of the stationary contacts and when the disks contract the member 21 will be moved laterally into engagement with the opposite stationary contact. It will thus be seen that by adjusting the diaphragm longitudinally of the bar 5 the throw of the needle or movable contact mem' ber 21 may be varied according to the expansion and contraction of the diaphragm, the latter being adjusted to any degree of tem erature by moving the same longitudinal y of the bar 5 until the socket 17 registers with the corresponding degrees, (indicated on a scale 25.)

In operation the device is set to indicate a predetermined temperature by sliding the diaphragm longitudinally of the bar 5 until the socket or bracket re 'sters with desired derec on the scale an in which position the co end of the needle will be intermediate the contact members 9 and 10. Should the tem perature rise or fall, the free end of the needle will move into engagement with either the contact member 9 or 10, thereby closing the circuit through the battery and si nal-bell to the binding-post 14 and thence t rough the frame and needle to either of said contact members, thereby sounding the alarm and notifying the operator of the variation in the v tem erature.

hen the device is used as a fire-alarm, the binding-post may be dispensed with, the terminals of the circuit being attached directly to the contact members 9 and 14.

Attention is also called to the fact that the members 9 and 10 may be adjusted within the insulating-bushings 8, so as to regulate the throw of the needle to a nioety.

. From the foregoing description it is thought that the construction and operation of the device can be readily understood by those skilled in the art, and further description thereof is deemed unnecessary.

Having thus described the invention, what is claimed is 1. In a device of the class described, a plurality of relatively stationary contact members, a thermostatic element, and a movable contact member actuated by the thermo-- static element and adapted to engage the stationary members for closing the circuit, said. element being adjustable longitudinally of 'the movable contact member thereby to vary the throw of said member.

2. In a device of the class described, a supporting-frame carrying a plurality of relatively stationary contact members, an expansible diaphragm adjustable longitudinally of the frame, a movable contact member actuated by the diaphragm to engage the stationary contact members, and means for clamping the diaphragm in adjusted position.

3. In a device of the class described, a supporting-frame carrying aplurality of relatively stationary contact members, a thermostatic element adjustable longitudinally of the frame, a movable contact member pivotally mounted on the frame and operatively connected with the thermostatic element for engagement with the stationary members, and means for clamping the said element in adjusted position.

4. In a device of the class described, a supporting-frame provided with'an overhangmg arm and carrying the plurality of'relatively stationary contact members, an expansible diaphragm adjustable longitudinally of the frame, a movable contact memberpivoted to the overhanging arm and operatively connected with the diaphra m for closing the circuit through the stat1onary contact members, and means for clamping the diaphragm in adjusted position.

5. In a device of the class described, a supporting-frame provided with an overhangmg arm and carrying a plurality of relatively stationary contact members, an expansible diaphragm mounted for sliding movement on the frame, a movable contact member pivoted to the overhanging arm and having a slot formed therein, said movable member being adapted to engage the stationary members for closing the circuit, and a pin carried by the diaphragm and engaging the walls of the slot.

6. In a device of the class described, a supporting-frame having one end thereof bentopposite end of the arm, and expansible diaphragm mounted for longitudinal movement on the frame, a movable contact member pivoted to the overhanging arm and operatively connected with the diaphragm for closing the circuit through the stationary contact members, and means for clamping the diaphragm in adjusted position.

8. In a device of the class described, a supporting-frame having one end thereof bent to form an overhanging arm and its opposite end provided with threaded pins forming relatively stationary contact members, said bar having one end thereof formed with a graduated scale, an expansible diaphragm mounted for longitudinal movement on the frame, a

movable contact member pivoted to the over- 9. In a device of the class described, a suppofting-frame having one end thereof bent upwardly and its opposite end provided with an overhanging arm, an expansiblev diaphragm having a socket depending from its lower face for the reception of the adjacent a portion of the frame, a post secured to the opposite face of the diaphragm and having its free end bifurcated, a movable contact member pivoted to the overhanging arm and havin a slot formed therein, a pin carried by the bi urcated end of said slot whereby the movement of the diaphragm Will actuate the movable member to close the circuit through the stationary contact members, and means for clamping the diaphragm in adjusted position.

In testimony that we claim the foregoing as our own we have hereto aflixed our signatures in the presence of two witnesses.

JESSE M. KNOWLES. SILAS A. GREGORY. Witnesses:

S. V. WHITAKER, .W. H. CORNELL. 

